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[plat-n-uh s]
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adjective Chemistry.
  1. containing bivalent platinum.
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Origin of platinous

First recorded in 1835–45; platin(um) + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for platinous

Historical Examples

  • Platinous oxalate, in fine copper-coloured needles, may be obtained by heating platinic oxide in a solution of oxalic acid.

    Cooley's Practical Receipts, Volume II

    Arnold Cooley

  • A black powder, soluble in excess of alkali, and freely so in the acids, forming brown solutions of the platinous salts.

British Dictionary definitions for platinous


  1. of or containing platinum, esp in the divalent state
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012